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Nibelung no Yubiwa

Manga Titles:
ニーベルングの指環, Harlock Saga: The Ring of the Nibelung, L'Anneau des Nibelungen (French), Nibelungen no Yubiwa, The Ring of the Nibelung

Description:

A sci-fi retelling of Wagner's "Ring of the Nibelungen", starring Captain Harlock.
The series was first serialized from 1990 to 1991 in Chuukosha Fan, a used car magazine (!). A sequel was published for free directly on Shinchousha's webpage from 1997 to 2000, making it probably the first online manga.